ATAT101 Final Review PDF

[**[Student study guide here]**](https://publish.obsidian.md/student/Content/ATAT/T101/T101+Home)**[!!]** **-Standard day** 15°C or 59°F, 29.92 \"Hg, 0 ft **-Static pressure** the resistance of airflow **-Boyle's law** pressure is inversely proportional to volume **-force...

[**[Student study guide here]**](https://publish.obsidian.md/student/Content/ATAT/T101/T101+Home)**[!!]** **-Standard day** 15°C or 59°F, 29.92 \"Hg, 0 ft **-Static pressure** the resistance of airflow **-Boyle's law** pressure is inversely proportional to volume **-forces in flight** drag, thrust, lift, weight **-Newton's laws** laws of acceleration, law of inertia, law of action and reaction **what does each law refer to** - - - **-for acceleration, the change the pitch** **-more speed more lift more drag more thrust** **-boundary layer, laminar flow** when the streamlines inside the boundary layer flow smoothly **-negative stability** the aircraft will increasingly oscillate around the original attitude **-what type of wing has the highest speed, more stable, more efficient, higher critical Mach number** Swept wing **-higher the temperature, higher the speed of sound, lower the temperature, lower the speed of sound, directly proportional** kinetic energy **-control stops** to prevent the pilot from inadvertently overcontrolling and overstressing the aircraft during normal maneuvers **-axis of the airplane (yaw-normal axis, pitch, dihedral-lateral axis,roll-longitudinal axis) is different from axis stability (longitudinal stability-horizontal stabilizer, and vertical stabilizer)** **-which flight control moves the airplane around the axis** - - - **-What makes a high angle of attack, keep air flow straight by invisible fence** leading edge slots, **-what is the purpose of a fence/strake,** keep air flow straight/laminar **- what are flight spoilers** help to turn with a drag on side **- what is a ground spoiler** Prevent taking off after touchdown by drastically reducing lift **-speed brakes** increase drag no change in lift **-how does a helicopter hover** - - - - **-angle of attack,** The angle at which the relative wind meets the chord line of the wing **-angle of incident** angle between the cord line of wing and longitudinal axis **-pitch angle** used to prevent stall, the angle between longitudinal axis and the horizon **-helicopter use cyclic(also changes pitch angle but only the one we use) and bend the swash plate to tilt to move forward, collective to change all the pitch angle to go up and down in altitude** **-vertical fins** Reduce the work required by the tail rotor **-What causes coning?** the loads/weights, coning when going up hovering, on the ground coming down. Faster the speed, less coning **- does coning decrease lift** yes **-Asymmetry of lift vs dissymmetry of lift** - - **-Vibration** - - - **-Swash plate** moves cyclically as a collective **-Coriolis effects** Blade speed changes due to center of gravity changing **-leading and lagging** the horizontal movement of the rotor blades forwards and backwards along a vertical hinge. **-Translating tendency** **tendency to move; tail rotor pushing to one side, slip to one side** **-Translation of lift** As a helicopter gains speed, additional lift is generated due to the increased efficiency of the rotor system. **-fenestron** The Fenestron is a technological advancement over the basic tail rotor. It is a protected tail rotor operating like a ducted fan. **-ground resonance** **-semi-rigid** a particular kind of instability which is a self-excited vibration which occurs on the ground On a semi-rigid rotor head system